In 2016 the EN388 Standard included impact testing. Although the EN 388 testing method is similar to the American ISEA testing, the testing areas and and scoring are different. EN388 only tests the impact on the knuckles and the test either is PASS or FAIL.
The American ISEA138 tests two areas, the knuckles and and fingers/thumb and the gloves were then given a performance rating 1 to 3 where 3 is the highest protection.
Impact gloves are Mechanical gloves and the glove selection is based on the duty of the glove. The glove duty is based on the coating on the palm and the material used to make the glove. The impact protection is secondary to this.
It is pointless using an impact glove with very low cut resistance where a high cut resistance glove is required.
European EN388 Markings
American ANSI/ISEA 138 Markings